<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>闭包</title>
</head>

<body>
    <div>

    </div>

</body>
<script>
    function fn() {
        let num = 10;

        return function () {
            num++;
            alert(num);
        }

    }
    fn()();//11 函数柯里化
    fn()();//11


</script>

</html>